Tube-number record
20HP4, 20HP4A, 20HP4B, 20HP4C, 20HP4D
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BrandTung-Sol
ClassCathode Ray Tube
BaseDuodecal
Filament6.3 V @ 0.6 mA
Construction
Primary TypeDisplay / CRT
EnvelopeRectangular Glass
Sections1
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage16000 V
Grid 2 Voltage500 V
Grid 1 Voltage125 V
H-C Voltage410 V
Audio Performance
Key Features
- Low voltage electrostatic focus
- Magnetic deflection
- Spherical faceplate
- Grey filter faceplate
- External single field ion trap
- Rectangular glass construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 14000 V | — | — | — | 0.1 mA |
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